Vibration damper



April 26, 1938. QLLSQN 2,115,427 Y VIBRATION DAMPER Filed Feb.- 25, 1935 INVENTOR.

Herbrz E. Olson ATTORNEY.

' invention relates vention mounted upong thei end thereof.

P tented Aprandmore particularly to a device of this'chartion engines.

The principal obje vide a vibration damper oi theabove character having an inertia member which is positioned I rubber bushings I9 are first assembled as a unit in balanced relation ItO thE axis of the crank shaft and so mounted-asjto bring'about a coun-f ter-balancing effect throughmovement in all directions. d I

Other objects/and advantages of the invention will become apparent from a. reading of the following description taken in connection with the .tion of the inertia member is then slipped over the rubber bushings and the two-parts are drawn vRefe ing now to .th draWing refeIence nu merallil indicates the forward end oi-the crank shaft of an internal combustion" engine having thevibration damper comprising 'thepresent in.-

damper comprises; athub lgeyedto the crank shaft'asiait l3 and provided with a radially ex-" tending flanged portion I 4 at the outer end thereof. The periphery of the flanged portion 14 may conveniently be grooved as at, l5 toprovidea pulley for receiving a belt todrive the engine 1 compressed.

fan (not shown).

In accordance with'th'e present invention it is i desirable that the inertia member of the damper be evenly balanced relativetogthe axis of the crank shaft andmounted in axially spaced rela tion to the hub in a manner to permit movement '5.

To this end a plurality of equi-distantly spaced pins i6 areprovided around the flangedlportion ll' of the in all directions relative thereto.

hub and extend therefrom in an" axial direction. Each of the pins I6 is provided'with an enlarged shoulder portion I'I adapted-to. seat in recesses l8 formed in the outer face ofqthe flange 'llQj w A rubber bushing I9 is pressfitted on each of the pins l6 against theshoulder :I'Land further held in place by spacer collars 2| positioned on reduced portions 22 of the 'pins at the outer ends thereof. I

enlarged' boresto receive the pin and bushing as semblies and a plurality of annular recesses]! I ct of the invention is to proele atibnt i vie r the damper a n-ion .the line z 'zr'drrrig.

I re-provided cent'rally of thebores to receive the and2l within'the bores to maintain theinertia member upon the bushings. It will be noted that the annular recesses 26 are deeper atthelrcentralpportions than at the ends thereof, the purpose of which will later appear.

In. assembling thedamper, the plus. it an together as by rivets 3|.

' v The rubber bushings in their original form are somewhat longer than the width of the annular recesses 26 but are deformed when the two-parts V of'the inertia member are drawn together so that they take the form shown in Fig. 1 wherein i the central portions thereof extend into the deeper portions of the recesses 26. By constructing the recesses 26 in this manner the rubber of the gbushings 1! is prevented from being squeezed Ibetween the two-parts of the inertia member when. they are drawn together. It may also be 'noted that the action of the inertiamember may ,be varied by varying the sizeand hardnessof thebushin'gs and the extent to which they are -s2A'Iter the inertia member has been-secured therubber bushings IS, the spacer members 2i are positioned on the reduced portion '22 of the pins and the ends ofthe pins deformed ,asat 23.

The vibration damper thus provided is capable of movement in all directions to effectively dampen out any unbalancedforces of the engine transmitted throughthe crank shaft I0 and is ,an improvement over previous dampers of simi lar character since it is capable of dampening out a axial as well as radial thrusts of the crank shaft. Various modifications of the device, as shown,

may be made without departing from the spirit v 'or scope of the invention which is to be' limited only by, the appended claims.

'Whatis claimed and desired to be securedfby Letters Patent is: e

W1. A vibration damper comprising a hubeprovided with a flanged portion,'a plurality of spaced vided with a plurality of equi-distantly spaced pins extending in an axial directionfrom said flanged portion, an inertia member carried' 'by pins, and a rubber rbushing between said 

